What function does a ground fault circuit interrupter serve?

A ground fault circuit interrupter (GFCI) is specifically designed to enhance electrical safety by monitoring the amount of current flowing through a circuit. When the GFCI detects a difference between the current entering and exiting the circuit—indicating a possible ground fault because current is leaking to the ground—it quickly de-energizes the circuit. This rapid response helps protect individuals from electric shock by cutting off the electricity before serious harm can occur.

The other options, while related to electricity, do not accurately describe the function of a GFCI. Increasing voltage, providing additional circuit amperage, or bypassing electrical resistance are not actions performed by a GFCI. Its primary role is to ensure safety by interrupting the circuit in the event of an electrical fault.